5 years ago


  • Text
  • Software
  • Hybrid
  • Packaging
  • Components
  • Electronics
  • Manufacturing
  • Assembly
  • Inspection
  • Soldering
  • Solder


ADVERTORIAL HighTech Stencil Material „Quality is never an accident; it represents the wise choice of many alternatives“. This quotation by William A. Foster aptly describes today‘s requirements for the selection of the right stencil for printing. Nowadays, a large number of variants are available that are combined with diverse rework processes or coatings to make lasered stencils better. In the following, a few examples are described to help with the decision … Rework is becoming increasingly more difficult to carry out, or is not permissible at all in newer finished products. For this reason, it is vital to do things right the first time. The continuously progressing miniaturization of electronic products, combined with increasingly finer grids and smaller apertures, places new requirements on the stencils. Which does not make it easier to choose the right stencil from the different variants available. 9mil (230μm) QFP opening in a 6mil (150μm CK Nanovate Stencil Very frequently, specialist rework or coating is then applied to achieve better release properties of the paste or reduce cleaning. Unfortunately, however, this very often has a negative effect on the life of the stencil. Claus Schulz has been employed with KOENEN GmbH since 2010. Claus Schulz was born in 1976 in Munich. After completing his school education, he started an apprenticeship as draughtsman in civil engineering in 1996, which he completed in 1998. Subsequently, he attended the Higher Technical Vocational School and passed the advanced technical college entrance qualification (1998). In 2000, he comple ted the basic studies in food technology, and in the following year, he successfully qualified as a Certified Fitness Manager at the BSA Academy. Mr Schulz held senior sales positions at several companies in the consumer electronics industry: From 1999 to 2001, he worked as Account Manager at Siemens/MMS, from 2001 to 2006, he held the position of Key Account Manager at Sagem Communications, and from 2006 to 2010, he headed the Key Account Management and Product Management department at Sky Deutschland. In 2010, Mr Schulz joined KOENEN GmbH where he initially held the position of responsible manager of Sales, Marketing, Purchasing and IT. In addition, he was a member of the management team. In January 2015, following the takeover of KOENEN GmbH by Christian Koenen GmbH, he took over functions in the business development area of Christian Koenen GmbH and has since then held the position of Head of Sales of KOENEN GmbH. In December 2015, he was promoted to Head of Sales Department of Christian Koenen GmbH. Claus Schulz’s areas of expertise include process optimization and traceability. CK Nanovate Nickel Stencil With all these advantages and disadvantages in mind, research was ongoing in the past few years on how to improve the basic material of the stencil in order to avoid any additional processes, where applicable. The newly designed CK Nanovate Nickel combines the improvements achieved over the past decade in respect of the printing performance and the life of the stencil. • Improved paste release properties as a result of finer grain sizes and enhanced laser-cutting properties • Better sealing of the print deposit thanks to a sharper cutting edge on the circuit board side • Self-cleaning effect almost equivalent to surface coatings • Extended useful life thanks to improved hardness and ductility • No waviness of the stencil on uneven printed circuit boards/ substrates As Tom Peters said: „All quality improvement comes via simplification.“ This means that if the raw material is already designed to guarantee a perfect print, there will be no need for any additional processes to improve it. As a result, error sources and additional processes are avoided and costs are reduced. 24 EPP EUROPE May 2017

Lecture The lecture looks at the history of stencil materials. Furthermore, it explains which raw material is best suited for printing stencils to achieve the best printing performance. These improved properties are documented in a number of comparisons and tests. Statement Miniaturization, smaller volumes and the complexity of the modules increase the demands for electronics production. As a result, the selection of the printing tool (stencil) is becoming even more important. In the past, less focus was placed on the raw material of the stencil as only a very limited choice was available. With the new CK Nanovate Nickel, a material specially designed for the requirements of the printing process is now being offered. As a result, it has become possible to improve the quality standards consistently. This development significantly supports the „zero defect strategy” in electronics manufacture. In conjunction with a consistently high quality of the printing tool, this will provide customers with a competitive edge in the market. The primary goal to be achieved is to facilitate an efficient printing process that will save your resources and thus reduce the environmental impact. New HighTech Materials for Stencil Printing Claus Schulz, Christian Koenen GmbH The precision stencil is the tool of choice for defining the print deposits in a wide variety of printing processes employed in the electronics industry. Since laser cutting machines were introduced, stainless steel has been the preferred raw material used for these stencils. For decades, the utilised stainless steel has not been changed, only the plates made from it have become increasingly thinner. With the arrival of Ultra Finepitch components (e.g. 0201, 01005 and μBGA) and new printing media, the conventional raw material has reached its limits and new materials for manufacturing the stencil had to be found. Sample Benchmark Board print pattern The lecture looks at the requirements that the raw material of the stencil must meet today. In this context, the manufacture, processing and also the impact on the print quality are examined in depth. A wide variety of stainless steel and Nickel materials are discussed. It will be pointed out which raw materials should be considered for which printing requirements. Profile The companies of Christian Koenen are the technological leaders and market leaders in Europe in the manufacture of high-precision metal stencils and precision screens for technical printing. The precision stencils and screens feature an extremely high degree of precision. This accuracy opens up wider process windows for the customers‘ production, saves costs and increases efficiency. From the beginning, the area of research and development enjoys the highest priority, and the innovative products – some of which have been patented – highlight this technological competence. Especially the areas failure analysis, customer-specific process development with focus on cost reduction coupled with enhanced quality, process training and the further development of new printing technologies require the new orientation of the Application Center – the new Inline Concept. Christian Koenen Kft was founded in Györ/ Hungary in 2013. QFP print deposits at 0.3 mm pitch for a stencil thickness of 130μm EPP EUROPE May 2017 25